Oxygen-19

Properties and data of the isotope ¹⁹O.

Content

General data

Name of the isotope:Oxygen-19; O-19Symbol:¹⁹O or 198OMass number A:19 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:11Isotopic mass:19.0035780(28) u (atomic weight of Oxygen-19)Nuclide mass:18.9991894 u (calculated nuclear mass without electrons)Mass excess:3.33289 MeVMass defect:0.154336332 u (per nucleus)Nuclear binding energy:143.76336724 MeV (per nucleus)
7.56649301 MeV (average binding energy per nucleon)Separation energy:S_N = 3.9556(26) MeV (first neutron)
S_P = 17.069(19) MeV (first proton)Half-life:26.88(5) sDecay constant λ:0.02578672546726 s^-1Specific activity α:8.173225951597 × 10⁺²⁰ Bq g^-1
22089799869.183 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Isobaric spin: 3/2Magnetic dipole moment:μ(μ_N) = 1.53238(7)Quadrupole moment Q:0.00362(13) barn (100 fm²)Nuclear g-factor:g_l = 0.612952Mirror nucleus:Sodium-19Year of discovery:1936

Radioactive Decay

Half-life T_½ = 26.88(5) s respectively 2.688 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁹F	100 %	4.8203(26) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹N.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 11) and isobaric (same nucleon number A = 19) with Oxygen-19. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 11	Isobar A = 19
4	¹⁵Be
5	¹⁶B	¹⁹B
6	¹⁷C	¹⁹C
7	¹⁸N	¹⁹N
8	¹⁹O	¹⁹O
9	²⁰F	¹⁹F
10	²¹Ne	¹⁹Ne
11	²²Na	¹⁹Na
12	²³Mg	¹⁹Mg
13	²⁴Al
14	²⁵Si
15	²⁶P
16	²⁷S
17	²⁸Cl